INDIUM-DOPED MoVTeNbOx CATALYST FOR SELECTIVE OXIDATION OF PROPANE TO ACRYLIC ACID

Abstract

Abstract: Indium-doped MoVTeNbO_x catalyst (Mo_1.00V_0.30Te_0.23Nb_0.12InyO_x) for the selective oxidation of propane to acrylic acid was prepared by the coprecipitation method. Compared with the MoVTeNbO_x catalyst without In-doping, the yield of acrylic acid on the above-mentioned catalyst was significantly increased. Indium-doped catalysts were characterized by X-ray diffraction, H₂ temperature-programmed reduction, scanning transmission electron microscopy and X-ray photoelectron spectroscopy. The results showed that proper amount of Indium-doping could effectively increase the content of Mo⁶⁺, V⁵⁺ and Te⁴⁺ on the surface of the catalyst, thereby influencing the activity of the catalyst and the selectivity of acrylic acid. The optimal range of y was 0.025 to 0.04. Indium-doping in this range helped to adjust the number of acid sites on the surface of the catalyst and improve the oxidation of the catalyst. Under the conditions of the reaction temperature of 400 ℃, the space velocity of 1 000 mL/(g·h), the n(C₃H₈): n(O₂): n(H₂O) equaling to 1:2:12 and the molar ratio In/Mo of 0.025, the conversion of propane was 67.99%, the selectivity of acrylic acid was 58.30%, and the yield of acrylic acid was 39.64%.

Key words: selective oxidation, acrylic acid, MoVTeNbO_x catalyst, indium-doped

References

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